JP2022058845A - Toilet roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-ply toilet roll in which a paper tube does not plastically deform by a cutting pressure, when a toilet roll of a predetermined width is cut out from a paper log.

SOLUTION: If the density of one piece of toilet paper is equal to or greater than 0.140 g/cm³ and equal to or less than 0.180 g/cm³, and the stress of a paper part 3 is equal to or greater than 13.0 N and equal to or less than 22.0 N, general collapse of a paper tube 2 can be greatly reduced. It is preferable that the stress of the paper tube 2 is equal to or greater than 7.0 N and equal to or less than 13.0 N, and it is preferable that a difference between the stress of the paper part 3 and the stress of the paper tube 2 is equal to or less than 12.0 N. Also, it is preferable that the tensile strength in the longer direction of the toilet paper is equal to or greater than 1.60 N and equal to or less than 2.20 N.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a two-ply toilet roll.

Most sanitary papers such as toilet paper and kitchen paper are commercially available as sanitary paper rolls in which an adhesive is applied and wrapped around the outer peripheral surface of a paper tube which is a paper core. FIG. 1 shows an end face of a toilet roll. The toilet roll 1 includes a paper tube 2 and a paper portion 3 in which toilet paper is wrapped around the paper tube 2. A spiral paper tube is often used for the paper tube 2 used for the winding core used for the toilet roll 1, and thick paper such as cardboard or kraft paper is used for the member.

In such a toilet roll 1, the base paper unwound from the raw roll is wound around a winding core, and a long paper log in which the end of the base paper is fixed on the outer peripheral surface of the roll is formed, and the paper is as shown in FIG. It is obtained by being sent on the log receiving guide 4 and cutting from the paper log to a predetermined width with a cutting blade 5 such as a log saw (see, for example, Patent Documents 1 and 2).

Jikkenhei 6-86687 Gazette Japanese Unexamined Patent Publication No. 2005-87788 Japanese Unexamined Patent Publication No. 2016-16951 Japanese Unexamined Patent Publication No. 2010-119582 Japanese Unexamined Patent Publication No. 2013-256131

It is desirable that the paper tube 2 has the strength to suppress the deformation of the toilet roll and to maintain the shape at the time of manufacture without being crushed so as to rotate smoothly when mounted on the holder and used. One of the causes of the paper tube 2 being crushed is the pressure received when cutting the paper log with the log saw 5.

FIG. 3 shows how the paper tube is deformed when the paper log is cut. The toilet roll 1 has various specifications for each product, and the winding length is long, and the paper portion 3 becomes hard in a hard-wound long product wound at high density. When the paper portion 3 becomes harder than usual, the cutting pressure for cutting the paper log with the log saw 5 increases, and the paper tube 2 may be crushed when the paper log is cut with the strength of the normal paper tube 2.

In order to prevent the paper tube 2 from being crushed when the paper log is cut, the strength of the paper tube 2 may be designed to be strong enough to withstand the cutting pressure when the paper portion 3 is the hardest. However, if the strength is increased, the cost of the member of the paper tube 2 increases, and the manufacturing cost increases. In addition, it becomes small and difficult to crush when it is disposed of, which may cause deterioration of usability. Therefore, it is desirable that the strength of the paper tube 2 be suppressed to the minimum necessary strength according to the specifications of the toilet roll 1.

However, since the relationship between the specifications of the toilet roll 1 and the cutting pressure was not clear, it was difficult to design the optimum strength of the paper tube 2 for each specification of the toilet roll 1.

The present invention has been made in view of such a problem, and an object thereof is a two-ply toilet roll in which a paper tube is not plastically deformed by a cutting pressure when a toilet roll having a predetermined width is cut out from a paper log. Is to provide.

In order to solve the above problems, one aspect of the present invention is a toilet roll including a paper tube and a toilet paper portion in which 2-ply toilet paper is wound around the paper tube, and one sheet of the toilet paper. The per-density is 0.140 g / cm ³ or more and 0.180 g / cm ³ or less, the stress of the toilet paper portion is 13.0 N or more and 22.0 N or less, and the stress of the paper tube is 7.0 N or more and 13 It is characterized in that it is 0.0 N or less, and the difference between the stress of the toilet paper portion and the stress of the paper tube is 12.0 N or less.

Another aspect of the present invention is further characterized in that the tensile strength of the toilet paper in the longitudinal direction is 1.60 N or more and 2.20 N or less.

Another aspect of the present invention is further characterized in that the length of the toilet paper in the longitudinal direction is 45 to 55 m, and the diameter of the toilet roll is 112 to 120 mm.

Another aspect of the present invention is further characterized in that the toilet paper has a basis weight of 14.0 to 17.0 g / m ² and a paper thickness of 180 to 225 μm.

In another aspect of the present invention, the paper tube is further characterized by being a spiral paper tube in which a plurality of strips of paper are bonded to each other.

Another aspect of the present invention is further characterized in that the diameter of the paper tube is 36 mm or more and 45 mm or less.

INDUSTRIAL APPLICABILITY The present invention can prevent plastic deformation due to the cutting pressure of a paper tube at low cost when cutting out a toilet roll having a predetermined width from a paper log.

It is a figure which shows the end face of a toilet roll. It is a figure which shows the state of cutting a paper log. It is a figure which shows how the paper tube is deformed at the time of cutting a paper log. It is a perspective view which shows the spiral paper tube of a two-layer structure. (A)-(c) is a figure which shows the process of manufacturing a two-layer structure spiral paper tube. It is sectional drawing including the central axis of a spiral paper tube.

The toilet roll of the present invention is a two-ply toilet roll. The two-ply toilet paper is a toilet paper consisting of one sheet of paper web.

The hardness of the paper portion 3 in the toilet roll 1 is mainly determined by the number of laminated toilet papers (ply), the stress of the toilet roll, the density per toilet paper, the tensile strength, the crepe ratio, the elongation rate, etc. It is a characteristic of. Therefore, the pressure (cutting pressure) for pressing the cutting blade against the paper log at the time of cutting has a correlation with the characteristics of the toilet paper, assuming that the sharpness of the cutting device is constant.

In particular, when the density per sheet of toilet paper is high, the space between the toilet papers becomes a cushion even if the pressure (cutting pressure) is high, and the pressure on the paper tube is reduced, but the density per sheet is low. Then, the roll of the toilet paper becomes hard and the pressure (cutting pressure) on the paper tube becomes large, so that the paper tube 2 has a property of being easily crushed.

Therefore, when the density per sheet of toilet paper is high, the pressure on the paper tube 2 is suppressed by setting the characteristics of the paper section 3 so that the stress with respect to the cutting pressure of the paper section 3 falls within a predetermined range, and the paper is suppressed. The crushing of the tube 2 is reduced.

The toilet roll of the present invention is a two-ply toilet roll in which the characteristics of the paper portion 3 are set to reduce the crushing of the paper tube 2. The paper density, tensile strength, crepe ratio, and elongation ratio in this specification are as follows.

The density per sheet of toilet paper can be obtained by dividing the basis weight by the paper thickness. The basis weight is the basis weight per sheet of toilet paper pulled out from the toilet roll according to JIS P8124, and the paper thickness is the toilet paper pulled out from the toilet roll after adjusting the humidity according to JIS P8111. Is measured according to ISO12625-3.

The tensile strength of toilet paper is the dry tensile strength, which is a value obtained by measuring a sample of paper cut to a width of 15 mm and a span length of 100 mm under the condition of a tensile speed of 50 mm / min and calculating the average of 6 measurements. Is. For the measurement of the tensile strength, for example, a horizontal tensile tester (manufactured by Kumagai Riki Kogyo Co., Ltd.) can be used.

The elongation rate of the toilet paper is a value obtained by measuring a sample obtained by cutting the paper into a width of 15 mm and a span length of 100 mm under the condition of a tensile speed of 50 mm / min and calculating the average of 6 measurements. The elongation rate (%) is determined by the elongation amount (mm) × 100 / span length (mm) of the sample.

The crepe rate is calculated by (Yankee dryer speed-reel speed) / reel speed x 100. When the crepe ratio increases, the vertical tensile rupture elongation increases, and when the crepe ratio decreases, the vertical tensile rupture elongation decreases.

The stress of the paper part and the stress of the paper tube are "crush strength", and a toilet roll or a paper tube is placed on a surface plate so that the central axis is horizontal, and a circular flat compression of 1 cm ² is performed. It is a value measured as the pressure when the toilet roll or the paper tube is vertically crushed at the center position in the length direction and the tip of the push-pull gauge is pushed in by 5 mm by a push-pull gauge equipped with a jig. The strength of the paper tube can be adjusted by adjusting the diameter of the paper tube, the content of kraft pulp in the base paper, the basis weight, the density, the smoothness of the adhesive surface of the base paper, the amount of adhesive applied, etc. (See, for example, Patent Document 3).

The paper tube 2 used for the winding core of the toilet roll can be a spiral paper tube formed by spirally winding a plurality of base papers.

FIG. 4 shows a perspective view of a spiral paper tube having a two-layer structure. As shown in FIG. 4, the paper tube 2 is formed by spirally winding an inner base paper 21 and an outer base paper 22 made of two strips having a width of about 60 to 80 mm, for example, while adhering them to each other with an adhesive. It may be a spiral paper tube having a two-layer structure formed.

FIGS. 5 (a) to 5 (c) show steps for producing a spiral paper tube having a two-layer structure. In order to manufacture the paper tube 2, first, the inner surface base paper 21 is fed diagonally with respect to the central axis of the mandrel shaft 6, and the side edges of the inner surface base paper 21 are overlapped with each other by a predetermined width with respect to the mandrel shaft. Wrap it in a spiral shape. The overlap between the side edges of the inner base paper 21 is, for example, about 0.5 to 3.0 mm. In parallel with the winding process of the inner base paper 21, an adhesive is applied to the inner surface of the outer base paper 22 to form an adhesive layer, and the outer base paper 22 is slanted with respect to the central axis of the mandrel shaft 6. It is fed in the direction and spirally wound around the inner base paper 21 wound around the mandrel shaft 6 so as to be bonded to the inner base paper 21 by an adhesive layer so that the side edges of the outer base paper 22 do not overlap with each other. .. When the paper tube 2 to which the inner surface base paper 21 and the outer surface base paper 22 are bonded is sent out, the paper tube 2 protruding from the mandrel shaft 6 is cut to a predetermined length by the cutting blade 7 (for example, Patent Documents 4 and 5). reference).

FIG. 6 shows a cross section including the central axis of the paper tube. An adhesive layer 23 is formed between the inner surface base paper 21 and the outer surface base paper 22, and the inner surface base paper 21 and the outer surface base paper 22 are bonded to each other by the adhesive layer 23 to form a paper tube 2. It is desirable that the seam of the outer base paper 22 is arranged at a position that does not overlap with the seam of the inner base paper 21.

The two-ply toilet roll 1 in the present invention has the stress of the toilet roll required to prevent the paper tube 2 from being plastically deformed by the cutting pressure when cut out from the paper log. As a specific example, the following table shows examples in which the paper tube 2 is not plastically deformed when the paper log is cut with the log saw 5 in the combination of stress, density, tensile strength, and elongation of the 2-ply toilet roll 1. Shown in. Further, as a comparative example, a case where the paper tube 2 is crushed due to insufficient strength of the paper tube 2 is also shown.

A conventionally known cutting blade can be used as the cutting blade of the log saw, and a log saw blade (cutting blade) having a thickness of 2 to 10 mm is preferably used.

The stress of the paper portion 3 is strongly influenced by the density of the paper, and is also influenced by the tensile strength, the crepe ratio, and the elongation ratio.

Table 1 shows some of the experimental results. The density per toilet paper is 0.140 g / cm ³ or more and 0.180 g / cm ³ or less, and the stress of the paper part 3 is 13.0 N or more and 22.0 N. If the following, the crushing of the general paper tube 2 can be significantly reduced.

If the density per toilet paper is 0.150 g / cm ³ or more and 0.180 g / cm ³ or less, the paper tube 2 is more difficult to be crushed. Further, the stress of the paper portion 3 is preferably 13.0 N or more and 20.0 N or less. This is because when the stress of the paper portion is 20.0 N or more, it may be deformed into an elliptical shape although it is not crushed.

On the other hand, the stress of the paper tube 2 is preferably 7.0 N or more and 13.0 N or less, and the difference between the stress of the paper portion 3 and the stress of the paper tube 2 is preferably 12.0 N or less.

The tensile strength of the toilet paper in the longitudinal direction is preferably 1.60 N or more and 2.20 N or less, the basis weight per sheet of toilet paper is 14.0 to 17.0 g / m ² , and the paper thickness is 180. It is preferably about 225 μm.

The basis weight of the paper tube 2 is preferably 130 to 180 g / m ² , and the thickness is preferably 180 to 300 μm. The diameter of the paper tube 2 is preferably 36 mm or more and 45 mm or less.

In Table 1, the winding length of the toilet roll is 50 m and the winding diameter is 114 mm, but the above requirements are the density per toilet paper, the stress of the paper portion 3, the stress of the paper tube 2, and the tensile strength in the longitudinal direction of the toilet paper. If the above conditions are satisfied, the winding length of the toilet roll can be 45 to 55 m, and the winding diameter can be 112 to 120 mm.

1 Toilet roll 2 Paper tube 3 Sanitary paper part 4 Paper log receiving guide 5, 7 Cutting blade 6 Mandrel shaft 21 Inner surface base paper 22 Outer surface base paper 23 Adhesive layer

Claims (6)

A toilet roll provided with a paper tube and a toilet paper section in which 2-ply toilet paper is wrapped around the paper tube.
The density per sheet of toilet paper is 0.140 g / cm ³ or more and 0.180 g / cm ³ or less, the stress of the toilet paper portion is 13.0 N or more and 22.0 N or less, and the stress of the paper tube is A toilet roll characterized in that it is 7.0 N or more and 13.0 N or less, and the difference between the stress of the toilet paper portion and the stress of the paper tube is 12.0 N or less. The toilet roll according to claim 1, wherein the length of the toilet paper in the longitudinal direction is 45 to 55 m, and the diameter of the toilet roll is 112 to 120 mm. The toilet roll according to claim 1 or 2, wherein the toilet paper has a basis weight of 14.0 to 17.0 g / m ² and a paper thickness of 180 to 225 μm. The toilet roll according to any one of claims 1 to 3, wherein the tensile strength of the toilet paper in the longitudinal direction is 1.60 N or more and 2.20 N or less. The toilet roll according to any one of claims 1 to 4, wherein the paper tube is a spiral paper tube in which a plurality of strips of paper are bonded to each other. The toilet roll according to any one of claims 1 to 5, wherein the diameter of the paper tube is 36 mm or more and 45 mm or less.

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